Update

The Wii Vault now has the option to download in .nkit.iso or .wbfs format. NKit is the default and downloads from a mirror for fast speed, though not many games are mirrored yet. .wbfs files download from the main server but the current disk can't support many people at once.

There's a new format for Wii games called NKit which makes games about 33% smaller than a .wbfs file. That's a huge difference so all games in the Wii Vault have been converted to .nkit.iso. Recent releases of Dolphin support the .nkit format so the Emulation Lair will now have the current monthly Dolphin build.

Also, the Dreamcast Vault now has cover art for every game courtesy of the emulator Redream.